Seller notes

Water Tube Coupling for Alpha One Gen II Mercruiser Replaces 816597A1 & Sierra 18-31512 O-Rings and 1 CouplerWater Coupling AssemblyReplaces Mercury 816597A1Replaces Mallory 9-78110Water Tube CouplingAlpha Gen II 1991-UpMercury 3.0LIF you have any questions as to the fitment of our products please consult your local dealer before installing any parts yourself....

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